IDM Problem
Thread Starter
|
Senior User
Joined: Apr 2007
Posts: 140
Likes: 0
IDM Problem
Ok, i've been reading up but can't find the answer I'm looking for. Can an IDM cause just one injector not to fire or no? I still have had a rough idle and low power even after UVC harnesses, vc gaskets, IPR o rings, ICP, CPS, and cleaning everything. Ran a buzz test and #1 isn't working. Ohms out fine and these injectors only have about 2k miles on them, so I guess IDM is the only other thing right? Is there a voltage check I can do at the connector or should I just try to find an IDM to try? Thanks guys
Thread Starter
|
Senior User
Joined: Apr 2007
Posts: 140
Likes: 0
I'd rather not have to pull an injector. I have a friend with a wrecked 97, I will prob just go pull his IDM tonight and try it. I just wasn't sure if idm can cause one cylinder to drop or not. Didn't run the engine with the vc's off so I don't know. I did make the mistake of pressure washing the ingine when i first bought the truck so that is possible, and the truck sat in a field for over a year too before I got it. Thanks
Postmaster
Joined: Apr 2004
Posts: 3,658
Likes: 0
From: Ellensburg, Washington
if it did it would be a freak thing. Usually, once the IDM's go they go completely with no mercy. I would go back through your VC harnesses and see if they are toasted. Are they new from the dealer or outta your buddies wrecked '97?
Cowboy Steve
Cowboy Steve
Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
While the IDM's normally either drop dead or drop 4 cylinders at a time but it is possible that it could drop one. you said the injector ohmed out good right. at the valve cover connector it was less than 3 ohm? Easiest thing is to try another IDM. if thats not it you need to test the wiring right at the IDM connector.
Thread Starter
|
Senior User
Joined: Apr 2007
Posts: 140
Likes: 0
Yeah all my injectors across the board read at 3.6 at the vc plug. I just did UVC harnesses and vc gaskets today. They are all new from international. I got the IDM from the 97 tonight but going to check all the engine harness wires before pluggin it in. Can an injector be bad and still ohm out good?
Postmaster
Joined: Apr 2004
Posts: 3,658
Likes: 0
From: Ellensburg, Washington
I dont think I have evr heard of that but that dosnt mean it cant happen. Hope you find out whats keepin your truck down. Try the IDM swap and see where that leads you. Good luck!
Cowboy Steve
Cowboy Steve
Trending Topics
Thread Starter
|
Senior User
Joined: Apr 2007
Posts: 140
Likes: 0
thanks, im going to get back on it early am... does anyone have a pin layout of the idm harness? As in what pins run which injectors?
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Ford Super Duty: 5 Things Owners LOVE, 5 Things They LOATHE!
Joe Kucinski
Every 2026 Ford Truck Engine RANKED from WORST to FIRST!
Michael S. Palmer
The Best F-150 Deal of Every Trim Level (XL through Raptor)
Joe Kucinski
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
Does the engine rev up in neutral to the governed speed +/- 3300 rpm? If so, the IDM is good. The IDM doesn't care if the engine is loaded or free wheeling.
PM me your email address, I will send you the pin outs for the IDM.
BTW: There is 120V AC coming out of the IDM.
PM me your email address, I will send you the pin outs for the IDM.
BTW: There is 120V AC coming out of the IDM.
Thread Starter
|
Senior User
Joined: Apr 2007
Posts: 140
Likes: 0
Ok... Ohm'd out the engine harness to all injector, all are good. Nothing shorted to ground, checked all injectors again, all ohm'd good. Put the new IDM in, presto... No more 7 cylinder powerstroke. Still get's a little rough on the idle once warm, but I also need a new flywheel. Thanks for the help guys! Also, is there anyone who rebuilds IDM's? Wouldn't mind sending mine out to get rebuilt for a spare.
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
Take a look here for some insight into the IDM. This link is for a mod but it will give you something to think about. Like a 120V IDM vs 110V, it's worth an extra 5-10 HP & 30 ft lbs of torque
http://www.forgotton.net/diesel/idmmod/index.htm
http://www.forgotton.net/diesel/idmmod/index.htm
Last edited by Cuda_jim; Jul 8, 2007 at 02:22 PM.
Postmaster
Joined: Apr 2004
Posts: 3,658
Likes: 0
From: Ellensburg, Washington
Beans Diesel Performance will rebuild your IDM to either stock 94-97 specs, or 99.5-03 specs, or they can mod it to do a full 140v. Give them a shot they arent to spendy.
Cowboy Steve
Cowboy Steve
Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
Check out this search on Ebay. Any of the IDM's from the "auto computer exchange" are excellent.
http://motors.search.ebay.com/IDM_Pa...40QQsacatZ6028
http://motors.search.ebay.com/IDM_Pa...40QQsacatZ6028
Senior User
Joined: Aug 2006
Posts: 108
Likes: 0
From: Marrero La.
Man there sure are many things for me to learn. So many symbols and aberrations But I am pretty good at searching.
Whats a IDM?
Here you go.
The Injector Driver Module IDM controls power to the fuel injectors based on information received from the PCM. The IDM receives two digital control signals from the PCM: the Fuel Delivery Control Signal and the Camshaft Position Signal. The Fuel Delivery Control Signal is used by the IDM to control injection timing and injection duration. The CMP signal provides synchronization to the engine's first and the fifth injector (firing order, cylinders number one and four). The IDM verifies that fuel that Fuel Delivery Control Signal and CMP occur at valid timing intervals for synchronization.
as quoted from dieselsite
Whats a IDM?
Here you go.
The Injector Driver Module IDM controls power to the fuel injectors based on information received from the PCM. The IDM receives two digital control signals from the PCM: the Fuel Delivery Control Signal and the Camshaft Position Signal. The Fuel Delivery Control Signal is used by the IDM to control injection timing and injection duration. The CMP signal provides synchronization to the engine's first and the fifth injector (firing order, cylinders number one and four). The IDM verifies that fuel that Fuel Delivery Control Signal and CMP occur at valid timing intervals for synchronization.
as quoted from dieselsite
Last edited by elvia; Jul 28, 2007 at 09:44 AM.